FLNA Sequencing

X-linked periventricular heterotopia (also called periventricular nodular heterotopia or PNH) is caused by point mutations or deletions affecting the FLNA gene with presumed loss of function. About 80% of individuals with X-linked periventricular heterotopia have a detectable mutation in the FLNA gene. Most cases of X-linked periventricular heterotopia are caused by point mutations. MLPA analysis of select exons (4, 11, 22, 25, 29, 39, and 46) is also performed.

In addition, FLNA mutations with presumed gain of function are reported in association with four other disorders (Frontometaphyseal dysplasia, Melnick-Needles syndrome, Oto-palato-digital syndrome type I, and Oto-palato-digital syndrome type II). There is overlap of the various findings with these conditions. However, the main features are skeletal findings such as craniofacial abnormalities, scoliosis, and digit abnormalities as well as deafness and genitourinary findings.

Forms & Docs

Ordering

Place an order

Test Code
S0013

Turn Around Time
6-8 weeks

Billing

CPT Code
81479×1

Ordering Guidance

Most cases are due to sequence variants. Therefore, sequencing should be ordered first. If sequencing is unrevealing, then deletion/duplication analysis may be considered.
If Melnick-Needles syndrome is suspected, then beginning with mutation analysis of exon 22 may be considered.

If there are questions regarding this test, please contact Client Services at 617-553-5880 or clientservices@claritasgenomics.com

Details

Genes Covered
FLNA

Methods
Sanger